Skillwise cics part 1
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This document provides an overview of the SKILLWISE-CICS Application Programming course. It includes pre-requisites for the course, references and books used, the course schedule, and concepts about CICS including components, control programs and tables, transactions, start-up, sign on/off processes, program structure and execution, basic CICS commands, exception handling, and sample programs. It also describes how to define resources in CICS control tables using CEDA and CEMT commands.
![CICS Command Format
• General Command Format:
EXEC CICS Command
[option (value)] ....
END-EXEC
• command : a CICS service request
• option : one of the options available to command
• value : determines the characteristics of the value to be
placed for the option as detailed information
Example: EXEC CICS SEND
FROM(ws-var)
LENGTH(emprec)
END-EXEC](https://image.slidesharecdn.com/skillwisecics-part1-160112092316/85/Skillwise-cics-part-1-19-320.jpg)
Skillwise cics part 1
- 2. Pre-requisites MVS and TSO/ISPF subsystem JCL & VSAM concepts Programming in COBOL
- 3. References TITLE AUTHOR PUBLISHER CICS for COBOL programmer Doug Lowe Mike Murach & Associates CICS Handbook Kageyama Tata McGraw Hill CICS command level Programming Alida M Jatich John Wiley and Sons Inc., CICS using COBOL Andrew M. Suhy Galgotia
- 4. Course Schedule Introduction to CICS Basic CICS commands Application programming
- 5. CICS-Customer Information Control System • CICS is a transaction manager designed for rapid, high-volume online processing. This processing is mostly interactive (screen-oriented). • CICS being a transaction processing system is also called as Online Transaction Processing (OLTP) Software. • The initial version of CICS was macro level i.e. assembler type commands were used to request a CICS service. • In CICS command level, each command could achieve the function of what a series of CICS macros could achieve.
- 6. CICS System Concepts Operating system mDatabase/Data access methods mTelecommunication Access methods CICS Application Programs (COBOL,PLI,Assembler) Data Handling System Services Monitoring Functions Data Communication Functions Application Program Services CICS
- 7. CICS System Components CICS consists of five major system components Data-Communication Functions Data-Handling Functions Application Program Services System Services Monitoring Functions
- 8. CICS System Components(contd..) Data Communication Functions :- Provides an interface between CICS and terminals or other systems. Data Handling Functions :- Provides an interface between CICS and data.
- 9. CICS System Components (contd..) Application Program Services :- Provides an interface between CICS and application programs System Services :- Provides an interface between CICS and the operating system. Monitoring Functions :- Monitors various events within CICS and provides a series of statistics to be used for system tuning.
- 10. CICS Control Program and Tables The core portion of CICS(called the CICS nucleus) consists of IBM-supplied CICS control programs and corresponding user-specified CICS control tables.
- 11. CICS Region CICS Nucleus Application program TCA TIOA PCP PPT PCT SCPKCP TCT TCP Others LOADLIB Terminal DCA
- 12. CICS Control Program and Tables CICS Control Program CICS Control Tables FCP(File Control Program) FCT(File Control Table) JCP(Journal Control Program) JCT(Journal Control Table) KCP(Task Control Program) PCT(Program Control Table) PCP(Program Control Program) PPT(Processing Program Table) SCP(Storage Control Program) No Associated Table. SCP(System Initialization Program) SIT(System Initialization Table) TCP(Terminal Control Program) TCT(Terminal Control Table) TDP(Transient Data Program) DCT(Destination Control Table) TSP(Temporary Storage Program) TST(Temporary Storage Table)
- 13. Transaction • CICS transaction is a collection of logically related programs in an application • All CICS transactions have four character identifiers associated with them known as Trans IDs
- 14. CICS Start-Up CICS itself is a job in which the main job step is the CICS System Initialization Program (SIP). Upon execution SIP loads the corresponding System Initialization Table (SIT), based on which all the control programs and tables are loaded. Finally CICS is ready to execute a transaction within it’s own region.
- 15. CICS SIGNON AND SIGNOFF CICS supplied transaction CESN/CSSN is used to sign on to the CICS region. The security information of all users is registered in SignOn Table(SNT). The primary function of CICS sign-off is used to disassociate CICS user identifier from CICS in terms of security.
- 16. Structure of CICS Application Program IDENTIFICATION DIVISION • Program-ID is required. ENVIRONMENT DIVISION • Only the header is required. No other entries such as INPUT- OUTPUT SECTION, FILE CONTROL or SELECT needed DATA DIVISION • FILE SECTION (including FD) not required. • WORKING-STORAGE SECTION is required. • LINKAGE SECTION is optional
- 17. Structure of CICS Application Program(Cont..) PROCEDURE DIVISION • Code is mixture of standard COBOL statements and special CICS commands • The following statements are prohibited: ACCEPT, DISPLAY, STOP RUN, CURRENT-DATE, DAY Any I/O statements (OPEN,CLOSE,READ,WRITE,REWRITE,DELETE.START) • SORT feature • CICS application programs must end with CICS RETURN command.
- 18. Compilation of Cobol-CICS program SOURCE CODE TRANSLATOR TRANSLATOR LISTING TRANSLATED SOURCE CODE COMPILER COMPILER LISTING OBJECT MODULE LINKAGE EDITOR LOAD MODULE LINK EDIT LISTING
- 19. CICS Command Format • General Command Format: EXEC CICS Command [option (value)] .... END-EXEC • command : a CICS service request • option : one of the options available to command • value : determines the characteristics of the value to be placed for the option as detailed information Example: EXEC CICS SEND FROM(ws-var) LENGTH(emprec) END-EXEC
- 20. Program Execution Process • Plan the transaction and design the program • Code the program • Translate, compile and link edit the program to create Load module • Define Program in PPT • Define transaction in PCT with program name • Define the mapset in PPT • Define the files, if required, in FCT • Sign on to CICS • Enter the transaction identifier
- 21. CICS Program Invocation User Enters TRANS-ID CICS finds TRANS-ID in PCT to get program name CICS finds program name in PPT CICS loads program into memory/ starts program CICS runs program in address space TRANS-ID = Transaction Identifier PCT = Program Control Table PPT= Processing Program Table
- 22. Basic CICS Commands SEND command: To sent data to a terminal. Syntax EXEC CICS SEND FROM(variable name) LENGTH(length of variable) END-EXEC. 22
- 23. Ways of Initiating a Transaction Entering a transaction identifier in a terminal with ENTER key. Transaction identifier associated with a terminal for pseudo-conversation. START command which initiates a transaction specified in the parameter. Automatic Transaction Initiation(ATI). By a 3270 attention identifier by defining PF and PA keys in PCT for IBM 3270 terminal. 23
- 24. Basic CICS commands (Cont…) RECEIVE command: To receive data from a terminal. Syntax EXEC CICS RECEIVE INTO (variable name) LENGTH(length of variable) END-EXEC. 24
- 25. Basic CICS commands (Cont…) • RETURN command: To terminate the transaction and return control to CICS. Syntax: EXEC CICS RETURN END-EXEC. 25
- 26. Exception Handling in CICS • To handle expected CICS errors – HANDLE CONDITION – RESP – The above errors can be ignored by using IGNORE CONDITION or NO HANDLE 26
- 27. Handle and Ignore Condition • HANDLE CONDITION EXEC CICS HANDLE CONDITION LENGERR (LENGTH-ERR-PARA) INVREQ (INVREQ-ERR-PARA) DUPKEY (DUPKEY-ERR-PARA) ERROR (GEN-ERR-PARA) END-EXEC. • IGNORE CONDITION EXEC CICS IGNORE CONDITION LENGERR END-EXEC. 27
- 28. RESP Code Handling WORKING-STORAGE SECTION. 01 WS-RCODE PIC S9(8) COMP. --------- PROCEDURE DIVISION. --------- EXEC CICS SEND FROM (-----) LENGTH (-----) RESP (WS-RCODE) END-EXEC. IF WS-RCODE = DFHRESP (LENGERR) PERFORM LENGTH-ERROR-PARA-0100. 28
- 29. Handle Aid Command It is used to specify the label to which control is to be passed when the specified AID is received. Example EXEC CICS HANDLE AID PF3(END-ROUTINE) PA1(CANCEL-ROUTINE) ENTER(NORMAL-ROUTINE) ANYKEY(WRONG-KEY-ROUTINE) END-EXEC. 29
- 30. EXEC INTERFACE BLOCK • EIB contains system related information pertaining to a task . Gives information like Task number Transaction ID and Terminal ID CICS response code from the last command etc. 30
- 31. Attention Identifiers It indicates which method the terminal operator has used to initiate the transfer of information from the terminal device to CICS. Example IF EIBAID=DFHPF3 PERFORM END-ROUTINE. IF EIBAID =DFHPA1 PERFORM CANCEL-ROUTINE. IF EIBAID =DFHENTER PERFORM NORMAL-ROUTINE. GO TO WRONG-KEY-ROUTINE. 31
- 32. CICS Supplied Transactions CESN : CICS Execute Sign ON CEDA : CICS Execute Definition and Administration CEMT :CICS Execute Master Terminal CECI : CICS Execute Command Interpreter CEDF : CICS Execute Debug Facility CESF : CICS Execute Sign OFF CEBR : CICS Execute temporary storage BRowse
- 33. CICS Hello World – Sample Program 33 Step 1: Open a tso session. Step 2: Create a new PDS. Step 3: Code the following program in a new member.
- 34. Execution of Hello World Program 34 After the translation and compilation process, Open an CICS session for Mainframe. Enter your User id and Password and press the Enter Key.
- 35. Defining Resource in Control Tables • To define a Transaction entry in PCT Table use the below command in CICS region. CEDA DEFINE TRANSACTION(TRAN- ID) PROGRAM(PROGRAM-NAME) • Once define process is completed , need the Installation process for Transaction id in PCT table. Use the below command for installation. CEDA INSTALL TRANSACTION(TRAN-ID) • Once Installation is completed for Tran-id, use the below command in CICS region To Find out a Transaction- Id details from PCT table. CEMT INQUIRE TRANSACTION(TRAN-ID) 35
- 36. Defining Resource in Control Tables (Cont…) • PPT(Processing Program Table) :This Table contains the name of the program and map details. • To define a program entry or MAP entry in PPT table , use the below command in CICS region. CEDA DEFINE PROGRAM(PROGRAM- NAME) - For program definition CEDA DEFINE MAPSET(MAPSET- NAME) – For Map definition 36
- 37. Defining Resource in Control Tables (Cont…)• Once define process is completed , need the installation process for Program, Map CEDA INSTALLATION PROGRAM(PROGRAM-NAME) CEDA INSTALLATION MAPSET(MAPSET NAME) • After completing the installation process for entry, use the command in CICS region to find out the program details from PPT Table. CEMT INQUIRE PROGRAM(PROGRAM-NAME) • By using below command in CICS region, we can find the Tran- id Details for the specified program. CEMT INQUIRE TRANSACTION PROGRAM(PROGRAM-NAME) 37
- 38. Defining Resource in Control Tables (Cont…) • If CICS program is modified or compiled, the new copy of the load module has to be loaded into main storage. CEMT is used to refresh the load module CEMT SET PROGRAM(PROGRAM- NAME) NEWCOPY (OR) CECI SET PROGRAM(PROGRAM- NAME) NEWCOPY • Using below command we can test the map CECI SEND MAP(MAPNAME) MAPSET(MAPS ET- NAME)